Inspired by its legendary amps, Marshall Headphones has created a smartphone that lets you rock out wherever you are. Meet the Marshall London, designed with music in mind. The London might just be the loudest mobile phone on Earth. With two front-facing speakers, you can enjoy your music without the use of headphones, though it's also equipped with not one, but two stereo jacks – allowing you and a friend to plug in and share your music or watch a video together.